From af94824bcad5bc242957f933b5aa6f410d8d3005 Mon Sep 17 00:00:00 2001
From: Kevin Hester <kevinh@geeksville.com>
Date: Wed, 10 Mar 2021 11:01:07 +0800
Subject: [PATCH] fix #65 missing padding on seturl

---
 .vscode/launch.json    |  2 +-
 meshtastic/__init__.py | 11 ++++++++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/.vscode/launch.json b/.vscode/launch.json
index c53d43a..895b0ce 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -58,7 +58,7 @@
       "request": "launch",
       "module": "meshtastic",
       "justMyCode": true,
-      "args": ["--seturl", "https://www.meshtastic.org/c/#GAMiENTxuzogKQdZ8Lz_q89Oab8qB0RlZmF1bHQ="
+      "args": ["--seturl", "https://www.meshtastic.org/d/#CgIYAw"
       ]
     },
     {
diff --git a/meshtastic/__init__.py b/meshtastic/__init__.py
index 851d561..ba966a7 100644
--- a/meshtastic/__init__.py
+++ b/meshtastic/__init__.py
@@ -391,7 +391,16 @@ class MeshInterface:
         # URLs are of the form https://www.meshtastic.org/d/#{base64_channel_set}
         # Split on '/#' to find the base64 encoded channel settings
         splitURL = url.split("/#")
-        decodedURL = base64.urlsafe_b64decode(splitURL[-1])
+        b64 = splitURL[-1]
+
+        # We normally strip padding to make for a shorter URL, but the python parser doesn't like
+        # that.  So add back any missing padding
+        # per https://stackoverflow.com/a/9807138
+        missing_padding = len(b64) % 4
+        if missing_padding:
+            b64 += '='* (4 - missing_padding)
+
+        decodedURL = base64.urlsafe_b64decode(b64)
         channelSet = apponly_pb2.ChannelSet()
         channelSet.ParseFromString(decodedURL)